Method of coating iron or steel sheets with a protective metallic coating



1,9so,9e1

Nov. 13, 1934.

W. H. SOMMER METHOD OF COATING IRON OR STEEL SHEETS WITH A PROTECTIVEMETALLIC COATING Filed Aug. 10, 1932 Patented Nov. 13, 1934 1,980,961METHOD OF COATING IRON OR STEEL SHEETS WITH A PROTECTIVE METALLICCOATING William H. Sommer, Peoria, 111., assignor, by mesne assignments,to The National City Bank of Cleveland, Cleveland, Ohio, and John A.Chapman, Chicago, Ill., trustees Application August 10, 1932, Serial No.628,164

1 Claim..

This invention has reference to a new and improved method of coatingiron or steel sheets with a protective metallic coating, the article socoated and the apparatus for coating. An ex- 5 ample of such a coatingis zinc spelter.

The invention has for its principal object the method of applying bywiping a protective metallic coating, as for example zinc spelter, toiron or steelsheets so as to provide such sheets with a lo heaviermetallic coating on one side of the sheet than on the other side thereofand to the sheet so coated. Such a sheet has considerable utility and anespecial advantage when subjected to outdoor use, as for examplewhenused for roofing 1: purposes, as experience has demonstrated thatmetallic coated sheets, especially if coated with zinc spelter will ruston their outside or exposed surfaces sooner than they' will on theinside. Therefore, by providing such sheets with a heavy go protectivecoating on one side and a light protective coating on the other side,the heavier coated side can be used as the exposed side and give longerlife thereto, resulting in greater economy in the use of such sheets.

The invention has for a further object an improvement in the feed-outrolls of galvanized pots which make it possible to obtain a heavycoating on one side of iron or steel sheets and a lighter coating on theopposite side thereof.

Further objects will more fully appear from the following description;

That the invention may be more fully understood reference is had to theaccompanying drawing forming part of the description illustratwhich:

Fig. 1 is a detail sectional view of an apparatus embodying my inventionby means of which it is possible to coat an iron or steel sheet with aheavy metallic coating on one side and with a lighter coating on theopposite side;

Fig. 2 is a detail in plan showing improved feed-out rolls, whereby itis possible to coat an iron or steel sheet with a heavier metalliccoating on one side thereof than on the opposite side,

and,

Fig. 3 is a detailsectional view showing an iron or steel sheet with aheavy metallic coating on one side thereof and a lighter coating on theopposite side. 4

Like characters of reference denote corresponding parts throughout thefigures.

In the drawing I have illustrated the use of the invention with zincspelter wherein a galvanizing ing a preferred embodiment of theinvention, in

pot of the usual construction is designated 1 in which is placed in theusual manner, molten lead a on the surface of which floats the moltenzinc b. 2 and 3 designate, respectively, the, feed-out rolls arranged toco-operate in the usual manner and between which the coated sheets 4 aredirected,

.as they leave the coating bath, as indicated in .iron 'or 'steel sheetthan on the opposite side thereof, I provide the roll 2'with apredeterminate number of circular grooves 5, but of fewer number than inthe roll 3 andin the roll 3 I provide a predeterminate' number ofcircular grooves 6 but of greater number than in the roll 2, somewhat asshown in Fig. 2. Practice will determine the number and depth of thegrooves in each roll, in respect of each other, as well as the spacingof such grooves in each roll. To keep the grooves in the respectiverolls clean to insure a proper application of the coating to thesurfaces of the sheet, I provide the cleaners or scrapers 7 and 8coacting with the grooves in the respective rolls 2 and 3, see Figs. 1and 2.

While the invention is especially useful where the metallic coating iszinc spelter, there will be instances where other metallic coatings maybe vfound equally useful and I, therefore, do not wish to be limited tozinc spelter.

What I claim is:--

The herein described method of coating iron or steel sheets with aprotective metallic coating of greater thickness on one side face of thesheet than on the Opposite side, which consists in passing the sheetsthrough a metallic coating bath to deposit the coating on each of theopposite side faces of the sheet, and then in simultaneously applyingthe coating by means of a pair of grooved rollers, the grooves on onebeing greater in number than those of the other and engaging out.

WILLIAM H. SOMMER.

